Tool/software:
Hello TI Support Team,
I am evaluating the DRA726 processor for product adoption
and have questions regarding CPU frequency scaling and voltage settings within warranty coverage.
Questions:
Does the proposed configuration remain within TI's warranty and support scope?
Specifically, using an eFuse offset of 0x0 (calibration value for 1000MHz) at low frequencies such as 400MHz or 600MHz.
In other words, is it appropriate to use the eFuse voltage calibrated for 1.0GHz (e.g., 1.06V) for a lower frequency like 400MHz or 600MHz?
■Current Configuration (SDK 6.03):
// arch/arm/boot/dts/dra7.dtsi
opp_supply_mpu: opp-supply@4a003b20 {
compatible = "ti,omap5-opp-supply";
reg = <0x4a003b20 0xc>;
ti,efuse-settings = <
/* uV offset */
1060000 0x0 // 1000MHz
1160000 0x4 // 1500MHz
1210000 0x8 // 1760MHz
>;
ti,absolute-max-voltage-uv = <1500000>;
};
■Proposed Configuration:
For power consumption reduction,
I am considering low CPU frequency operation (400MHz, 600MHz, 1000MHz):
ti,efuse-settings = <
/* uV offset */
1060000 0x0 // 400MHz (reusing 1000MHz eFuse value)
1060000 0x0 // 600MHz (reusing 1000MHz eFuse value)
1060000 0x0 // 1000MHz (original eFuse value)
>;
Information I Understand:
Based on previous e2e posts and documentation, I understand the following:
- Frequencies below the rated specifications are within the guaranteed operating range.
- Using values other than those specified for the eFuse is outside the scope of guaranteed operation.
- Using non-optimized voltages can significantly reduce device lifespan and increase power consumption.
The general consensus is as follows:
- Applying excessive voltage to lower frequencies can shorten the device’s lifespan.
I sincerely apologize for asking multiple questions.
I appreciate your help and look forward to your reply.
